Hinge pin
Amazing construction for automatic door closing. The door closes by it's own weight because it's lifted when you open it. Amazingly simple! Designed in 1930!
654
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faves
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Uploaded on October 19, 2006
Taken on October 17, 2006
Hinge pin
Amazing construction for automatic door closing. The door closes by it's own weight because it's lifted when you open it. Amazingly simple! Designed in 1930!
654
views
0
faves
0
comments
Uploaded on October 19, 2006
Taken on October 17, 2006